Display screen or portion thereof with a graphical user interface



FIG. 1 is a front view of a first image in a sequence for a display screen or portion thereof with a graphical user interface, showing our new design;

FIG. 2 is a front view of a second image in the sequence therefor; and,

FIG. 3 is a front view of a third image in the sequence therefor.

The drawings illustrate transitional images of a graphical user interface displayed on a display screen.

The appearance of the transitional images sequentially transitions between the images shown in FIGS. 1-3 such that the image in FIG. 2 includes a portion of the image of FIG. 1 that is partially zoomed in therefrom and such that the image in FIG. 3 includes a portion of the image of FIG. 2 that is further zoomed in therefrom. The process or period in which one image transitions to another image forms no part of the claimed design.

The outer-most broken lines, illustrating the boundary of a display screen, form no part of the claimed design. The remaining broken lines, illustrating portions of the graphical user interface, form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a graphical user interface, as shown and described. 